The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Histamine, ZO-1 and increased blood-retinal barrier permeability in diabetic retinopathy.

PURPOSES: First, to develop an improved retinal capillary endothelial cell culture system which exhibits some of the physiologic features of the bloodretinal barrier; second, to use this model to determine how histamine and chemical conditions of diabetes effect expression of the tight junction protein, ZO-1; and third, to discuss application of the Henle-Koch postulates to the problem of diabetic retinopathy. METHODS: Bovine retinal capillary endothelial cells were exposed to varying serum and growth factor concentrations, as well as astrocyte-conditioned medium, in order to establish a model of the blood-retinal barrier. Cells were also exposed to varying concentrations of histamine, and of insulin and glucose. The expression of ZO-1 tight junction protein was determined by immunocytochemistry and immunoblotting. RESULTS: Modified concentrations of growth factors reduced endothelial cell proliferation, without reducing viability. Astrocyte conditioned medium increased ZO-1 protein content. Histamine reduced ZO-1 protein content. Both high glucose (20mM) and low insulin (10(-12)M) reduced ZO-1 protein content compared to control conditions (5mM glucose and 10(-9) M insulin). CONCLUSIONS: Control of culture conditions results in a more physiologic in vitro model of the blood-retinal barrier. Soluble factors from astrocytes promote tight junction formation. Both histamine and chemical conditions of diabetes diminish tight junction formation. These factors may mediate blood-retinal barrier breakdown in diabetic retinopathy. Henle-Koch postulates for diabetic retinopathy are presented.[1]


  1. Histamine, ZO-1 and increased blood-retinal barrier permeability in diabetic retinopathy. Gardner, T.W. Transactions of the American Ophthalmological Society. (1995) [Pubmed]
WikiGenes - Universities